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Derivatives (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps $ 8,879,000,000 $ 7,681,000,000  
Estimated Fair Value of Credit Default Swaps 74,000,000 (41,000,000)  
Derivative Instruments, Gain (Loss) [Line Items]      
Embedded derivatives 1,239,000,000 (1,284,000,000) (387,000,000)
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges 1,000,000 (13,000,000) 9,000,000
Hedging exposure to variability in future cash flows for specific length of time 8 years 9 years  
Accumulated Other Comprehensive Income Loss 1,300,000,000 1,500,000,000 0
Deferred net gains (losses) expected to be reclassified to earnings (6,000,000)    
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion) 0 71,000,000 0
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges (98,000,000) (84,000,000)  
Potential future recoveries available to offset maximum amount of future payments under credit default swaps 150,000,000 115,000,000  
Cash collateral received for collateral arrangements and obligated to return 6,000,000,000 9,500,000,000  
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 3,700,000,000 2,500,000,000  
Securities owned and pledged as collateral for exchange-traded futures 40,000,000 42,000,000  
Cash collateral owned and pledged as collateral for exchange-traded futures 441,000,000 680,000,000  
Change in fair value of derivatives excluded from the assessment of hedge effectiveness (4,000,000) (3,000,000) 0
Nonperformance Risk [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Embedded derivatives (1,700,000,000) 1,800,000,000 (96,000,000)
Hedge Funds [Member]
     
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 10,000,000 10,000,000  
Estimated Fair Value of Credit Default Swaps $ 0 $ (1,000,000)